I have a 7100 and a Razr. I am using the sim card from the Razr and added BB data plan and all is good. My question is if I duplicate the sim card can I use both the 7100 and the Razr, kind of like an extension phone? Sometimes in airports I miss the volume of my Razr but don't want to chang sim cards.... Thanks

That is one great concept. If the mobile phone companies would allow this that would be great.

Have a few problems. The sim card is like a credit card one number one id. Your phone or mobile device is also the same. Is it possible to have two sim cards the same, I am going to say yes - is it legal no.

If you had both devices on. Received a call, both phones would ring but the one will cancel out the other. Not like a land line with to parties could be on the phone.

So this is what you can do. Add addition line to your main wireless account. This is why the companies don't offer this, more money. I am unclear if the blackberry allows to do call forwarding but I am sure it does. Now you can receive all your calls on your razr. The down side is you have two phone #s. You can have the razr forward the calls to the blackberry - then your screwed. - LOL

Either way your screwed. The phone companies want to make money. But if you have a source on dupping sim cards. I don't want to know I trying to stay honest.